What is Dense Rank Function in Structured Query Language SQL
What is Dense Rank Function in SQL?
#sqlfunctions #sqltutorialforbeginners #databasemanagement
Linkedin Group: / 14478259
Chapters:
00:00 Introduction
00:06 What is the DENSE_RANK Function in SQL?
00:10 Purpose and Basics of the DENSE_RANK Function in SQL
00:15 How DENSE_RANK Differs from RANK in SQL
00:21 Practical Example: No Gaps in Ranking in SQL
00:27 Understanding the Difference between RANK and DENSE_RANK in SQL
00:33 Comparing RANK and DENSE_RANK with Duplicate Values in SQL
00:40 Practical Demonstration of DENSE_RANK in SQL
00:46 Syntax and Usage
00:52 Example with RANK and DENSE_RANK Side-by-Side in SQL
00:55 Handling Gaps in RANK and DENSE_RANK in SQL
01:02 Practical Results and Observations
01:05 Application of PARTITION BY Clause in SQL
01:15 Conclusion and Summary
In this video from Educate Cube, the Dense Rank function is explained. The Dense Rank function assigns ranks to rows in a result set based on column values, similar to the Rank function, but without leaving gaps for tied values. For instance, if two rows have the same value, they both get the same rank, and the next rank continues sequentially.
In a practical example, the Rank function would skip ranks for duplicate values (e.g., two values with rank 7, followed by rank 9). In contrast, Dense Rank continues the sequence without gaps (e.g., two values with rank 7, followed by rank 8).
Understanding this difference is important for exams and interviews. The syntax for Dense Rank is similar to Rank, just replace "RANK" with "DENSE_RANK." Additionally, using the partition by clause resets the ranking for each group.
The video concludes with a reminder to like, share, and subscribe to the Educate Cube YouTube channel.